Photographic printer



J. W. C. SHIPMAN.

PHOTOGRAPHIC PRINTER.

APPLlcAxoN FILED MAY?. 1919.

1,369,560, Patented 2Gb. 22,1921.

' 2 SHEETS-SHEET l- J 2H.. e: [JW/'l 5 ,46E-J5 I. W. C. sHIPIvIAN.

PHDTOGRAPHIC PRINTER.

APPLICATION FILED MAYI. I9I9.

1,369,560. Patented Feb. 22, 1921.

2 i J4 2 SHEETS-SHEET 2.

UNITED sTAC'rEs PATENT OFFICE.

JOSEPH W. C. SHIPM-AN, F LOS ANGELES, CALIFORNIA.

PHOTOGRAPBIC PRINTER.

Specication of Letters Patent. Patented Feb. 22, 1921,

Application ledlay 7., 1919. Serial No. 295,798.

T o all wlwm t may concern:

Be it known that I, JOSEPH W. C. SHIP 'M AN, a subject ofthe King of Great Britam, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful. Photographic Printer, of` which the following is a specification.

My invention relates to the art of photographic printing, and the principal object of my invention is to provide a photographic printer for printing upon rolls of sensitized paper, the apparatus being so constructed that it can be regulated to' feed the paper to suit the length of print desired.

A further object of the invention is toy l bodiment ofV my invention.

Fig. 2 is a cross-section on the plane 2-2 of Fig. 1.

Fig. 3 is 'a plan view of myinvention.

F Fig. 4 is a cross-section on line 4-4 of ig. 5 is a cross-section on the line 5-5 of Fig. 3.

Fig. 6 is a diagram of connections. y,

Fig. 7 is a'detail of a contact finger.

Fig. 8 is a plan view on an enlarged scale showing the gear train.

In the form of the invention illustrated in the drawings, a. light box 11 is provided this light box having a plurality of incandescent lamps 12 therein, one at least of which, 13, may conveniently bea red light. The top of thelight box 11 may be closed by a plate of glass 14 upon which a negative l5 may be secured by any convenient means. A roll of sensitized paper is placed in a box 2O upon a roller 21, this box having a.

passies between friction roll 25 and a driving roller 26 to a roller 27 havinga slot 28 therein in which theend of the paper may be secured.

The whole apparatus is supported on a supporting structure 30. Sliding" in the structure 30 are two rods 31, these rods being secured at their upper end to a frame 32 to which are secured fourrods 33 which carry a platen 34. The rods 31 pass through a cross-piece 35 and have compression springs 36 therearound, these springs tending to hold the frame 32 in its upper position as shown in F ig. 2.

A pedal 37 is provided connected to the rods 3l and by means of which they4 can be pushed downwardl thus pulling the frame 32 downwardly. he pedal 37 1s also connected through braces 38 to the opposite side of the frame 32 to insure stiffness. For the purpose of regulating the travel ,ofthe pedal 37 collars 40 are provided on the rods 31, these collars having set screws 41 by means of which they can be secured in any position along the rods so that the upper position of the platen 34' above the negative 15 can be easily regulated, the platen in any case going down until it rests upon -K the paper on top of the'negative 15.

The platen is provided with a sheet of felt 45 or other resilient material and with four holding .fingers 46 having the form shown in Fig. 7. A movable contact 48 is provided on the frame 32 and a stationary Contact 49 is provided o n the frame 30, these contacts being so placed that they are in electrical connection with each other when the felt 45 rests on the paper on topv of the negative 15. l.

The lamps 12 are connected as shown in Fig. 6 to two wires 50 forming a source of electrical supply so that thesey lights are energized whenever the contacts 48 and 49 touch. An auxiliary switch 51 may be provided for lighting the li hts at other times,

and an auxiliary switc 52 may be provided for lighting the red lamp alone.A

T he rolls and paper are driven through a rack 60 which is secured on the side of the frame 32 and which actuates a gear 61 fixed to a shaft 59, an idler 62 and a gear 63. The

through a. bea 72. The but when 'n a loose on a shaft 73 and is frictionally engaged by fingers 74 which are rigidly se' cured to the shaft 73. rlhis shaft passes through a bearing 75 in the frame 30 and carries a ratchet wheel 76 engaged by a ratchet 77 The roller 27 has a square shank fitting into the ratchet 76 and has a round shank 7 8 fitting intoa spring bearing 79 carried in the frame 30 so that the roller 27. can be removed whenever it is filled with paper. The ratchet wheel 67 is engaged by a stationary pawl 80 carried on the frame 30. The method of operation is as follows: rlFhe pedal 37 being depressed, the platen 34 is pulled downwardly until the fingers 46 touch and hold the paper on top of the `negative 15 and until the felt 45 presses solidly against this paper holding it in in# Whentimate contact with the negative. ever this occurs the contacts 48 and 49 engage, the lights 12 are energized, the light passing through the negative l5 onto the paper and-making a photographic image thereon. Upon releasing the pedal 37 the -frame 32 rises due to the springs 36, the

lights are turned off and the wheels 61, 62 and 63 turn, thus turning the ratchet wheel 66 by means-of the pawls 65. This drives the roller 26 in a clock-wise direction as shown in Fig. l, the roller 26 coperating with the roll 25 to feed the paper 'from left to right across the negative 15. At the same time the roller 27 being frictionally driven through the finger 74 and the belt 72, winds up this paper on the roller 27. Upon pushing downwardly on the pedal 37 the pawls slip on the ratchet wheel 66 which is held from turning due to the fact that it is connected to the ratchet -Wheel 67 which is caught by the pawl 80. As a result the paper is not moved during the downward travel of the platen. The roller 27 is also held from turning on its downward movement by means of the ratchet wheel 66 and the pawl 77.

As the paper is only driven on the up stroke of the platen it is evident that the distance that the paper is driven can be regulated by regulating the travel of the platen. This is accomplished by' setting the collars 40 on the rods 31, these collars limiting the upward movement of the platen to any desired degree.

'The platen 34 is hinged to the rods 33 as shown so that it can be readily turned back 've access to the negative 15.

at l claim is 1. A photographic printer comprising a sensitized paper loosely in contact with said negative; a platen normally held above said negative; means for forcing and holding said platen against said paper; means for energizing said luminous source when said platen is so pressed; rollers Jfor feeding said paper across said negative; a rack secured to and moving in synchronism with said platen; a gear wheel mechanism driven by said raclr; and means by which said gear wheel actuates said rollers.

2. A photographic printer comprising a supporting structure; a light box fixed in said structure; a ,luminous source fixed in said box; means for supporting a negative over said box; means for holding a strip of sensitized paper loosely in Contact with said negative; a platen normally held above said negative; means for forcing and holding said platen against said paper; means for energizing said luminous source whenV said platen is so pressed; rollers for feeding said paper across said negative; a rack 'secured to and moving in synchronism with saidl platen; a gear wheel mechanism driven by said rack; pawls carried by said gear wheel said structure; a luminous source fixed in said box; means for supporting a negative over said box; means for holding a strip of sensitized papel' loosely in contact with said negative; `a platen normally held above said negative; means for forcing and holding said platen against said paper; means for energizing. said luminous source when said platen is so pressed; rollers for feeding said paper across said negative; a rack secured to and moving in synchronism with said platen; a gear wheel mechanism driven by said rack; pawls carried by said gear wheel mechanism; a ratchet wheel driven in one direction only by said pawls; a stationary pawl preventing said ratchet wheel from turning in the opposite direction; and means for securing said ratchet wheel to one of said rollers.

In testimony whereof I have hereunto set my hand at Los Angeles, California, this 2nd day of May, 1919.

JOSEPH W. C. SHIPMAN.

esv 

